"I'm cautiously optimistic that we won't get there," the treasurer said.

The unemployment rate sits at 5.8 per cent.

Commonwealth Bank of Australia senior economist Michael Workman does not expect the strong growth reading to prompt the Reserve Bank to lift the cash rate any time soon.

"In our view, there is unlikely to be a policy change until we see a clear shift to lower unemployment rates," Mr Workman said, adding that would need to coincide with higher inflation in coming quarters.

Exports were the biggest contributor to growth in the March quarter, adding 1.4 percentage points.

This coincided with the extraordinary event that Western Australia was not hit by cyclones in the March quarter.

"Our miners are exporting their socks off," Mr Hockey said.

However, Treasury secretary Martin Parkinson is sticking with his budget forecast for economic growth to return to below trend for a while yet.